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hongbin9
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| <?php | ||
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| namespace hobby\weixin; | ||
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| /** | ||
| * Prpcrypt class | ||
| * | ||
| * 提供接收和推送给公众平台消息的加解密接口. | ||
| */ | ||
| class Prpcrypt | ||
| { | ||
| public $key; | ||
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| function __construct($k) | ||
| { | ||
| $this->key = base64_decode($k . "="); | ||
| } | ||
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| /** | ||
| * 对明文进行加密 | ||
| * @param string $text 需要加密的明文 | ||
| * @return string 加密后的密文 | ||
| */ | ||
| public function encrypt($text, $appid) | ||
| { | ||
| try { | ||
| //获得16位随机字符串，填充到明文之前 | ||
| $random = $this->getRandomStr(); | ||
| $text = $random . pack("N", strlen($text)) . $text . $appid; | ||
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| $iv = substr($this->key, 0, 16); | ||
| //使用自定义的填充方式对明文进行补位填充 | ||
| $pkc_encoder = new PKCS7Encoder; | ||
| $text = $pkc_encoder->encode($text); | ||
| $encrypted = openssl_encrypt($text, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $iv); | ||
| return array(ErrorCode::$OK, $encrypted); | ||
| } catch (Exception $e) { | ||
| //print $e; | ||
| return array(ErrorCode::$EncryptAESError, null); | ||
| } | ||
| } | ||
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| /** | ||
| * 对密文进行解密 | ||
| * @param string $encrypted 需要解密的密文 | ||
| * @return string 解密得到的明文 | ||
| */ | ||
| public function decrypt($encrypted, $appid) | ||
| { | ||
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| try { | ||
| $iv = substr($this->key, 0, 16); | ||
| //使用BASE64对需要解密的字符串进行解码 | ||
| $decrypted = openssl_decrypt($encrypted, 'AES-256-CBC', $this->key, OPENSSL_ZERO_PADDING, $iv); | ||
| } catch (Exception $e) { | ||
| return array(ErrorCode::$DecryptAESError, null); | ||
| } | ||
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| try { | ||
| //去除补位字符 | ||
| $pkc_encoder = new PKCS7Encoder; | ||
| $result = $pkc_encoder->decode($decrypted); | ||
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| //去除16位随机字符串,网络字节序和AppId | ||
| if (strlen($result) < 16) | ||
| return ""; | ||
| $content = substr($result, 16, strlen($result)); | ||
| $len_list = unpack("N", substr($content, 0, 4)); | ||
| $xml_len = $len_list[1]; | ||
| $xml_content = substr($content, 4, $xml_len); | ||
| $from_appid = substr($content, $xml_len + 4); | ||
| } catch (Exception $e) { | ||
| //print $e; | ||
| return array(ErrorCode::$IllegalBuffer, null); | ||
| } | ||
| if ($from_appid != $appid) | ||
| return array(ErrorCode::$ValidateAppidError, null); | ||
| return array(0, $xml_content); | ||
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| } | ||
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| /** | ||
| * 随机生成16位字符串 | ||
| * @return string 生成的字符串 | ||
| */ | ||
| function getRandomStr() | ||
| { | ||
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| $str = ""; | ||
| $str_pol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz"; | ||
| $max = strlen($str_pol) - 1; | ||
| for ($i = 0; $i < 16; $i++) { | ||
| $str .= $str_pol[mt_rand(0, $max)]; | ||
| } | ||
| return $str; | ||
| } | ||
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| } |